mulitpart上傳不能使用android + rails

Question

我想通過Android應用程序上傳文件+字符串到我的Rails應用程序。但是在rails中使用分段上傳時，我總會遇到一個奇怪的錯誤。

我在客戶端使用Apache HttpClient 4.1.1 + httpMime Lib 4.1.1，在Serverside上使用Rails 3.0.10。

CountingMultipartEntity mpEntity = new CountingMultipartEntity(this); 
File file = new File(getRealPathFromURI(Uri.parse(local_uri))); 
ContentBody cbFile = new FileBody(file, "image/jpeg"); 

mpEntity.addPart("artifact[binary_payload]", cbFile); 
mpEntity.addPart("artifact[description]", new StringBody("test", Charset.forName("UTF-8"))); 

HttpPost post = new HttpPost(url); 
post.setEntity(mpEntity); 

HttpResponse response = mHttpClient.execute(post); 

這將是軌道錯誤行：

Error during failsafe response: ActionView::Template::Error 
    /Users/magu/.rvm/gems/ruby-1.9.2-p136@ssp/gems/activesupport-3.0.10/lib/active_support/whiny_nil.rb:48:in `method_missing' 
    /Users/magu/.rvm/gems/ruby-1.9.2-p136@ssp/gems/actionpack-3.0.10/lib/action_dispatch/http/parameters.rb:10:in `parameters' 
... 
    /Users/magu/.rvm/gems/ruby-1.9.2-p136@ssp/ 
09:51:55 NoMethodError (undefined method `rewind' for "test":String): 

我cannout找到這個任何解決方案 - 任何人有一個提示嗎？

感謝， 馬丁

Answer 1

創建多部分實體是這樣的：

MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE); 

它去上班。